1 files changed, 194 insertions, 0 deletions
diff --git a/libk3b/plugin/libsamplerate/src_linear.c b/libk3b/plugin/libsamplerate/src_linear.c
new file mode 100644
index 0000000..c1736d2
--- /dev/null
+++ b/libk3b/plugin/libsamplerate/src_linear.c
@@ -0,0 +1,194 @@
+/*
+** Copyright (C) 2002,2003 Erik de Castro Lopo <erikd@mega-nerd.com>
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "config.h"
+#include "float_cast.h"
+#include "common.h"
+
+static void linear_reset (SRC_PRIVATE *psrc) ;
+
+/*========================================================================================
+*/
+
+#define	LINEAR_MAGIC_MARKER	MAKE_MAGIC('l','i','n','e','a','r')
+
+typedef struct
+{	int		linear_magic_marker ;
+	int		channels ;
+	long	in_count, in_used ;
+	long    out_count, out_gen ;
+	float	last_value [1] ;
+} LINEAR_DATA ;
+
+/*----------------------------------------------------------------------------------------
+*/
+int
+linear_process (SRC_PRIVATE *psrc, SRC_DATA *data)
+{	LINEAR_DATA *linear ;
+	double		src_ratio, input_index ;
+	int			ch ;
+
+	if (psrc->private_data == NULL)
+		return SRC_ERR_NO_PRIVATE ;
+
+	linear = (LINEAR_DATA*) psrc->private_data ;
+
+	linear->in_count = data->input_frames * linear->channels ;
+	linear->out_count = data->output_frames * linear->channels ;
+	linear->in_used = linear->out_gen = 0 ;
+
+	src_ratio = psrc->last_ratio ;
+	input_index = psrc->last_position ;
+
+	/* Calculate samples before first sample in input array. */
+	while (input_index > 0.0 && input_index < 1.0 && linear->out_gen < linear->out_count)
+	{
+		if (linear->in_used + input_index > linear->in_count)
+			break ;
+
+		if (fabs (psrc->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
+			src_ratio = psrc->last_ratio + linear->out_gen * (data->src_ratio - psrc->last_ratio) / (linear->out_count - 1) ;
+
+		for (ch = 0 ; ch < linear->channels ; ch++)
+		{	data->data_out [linear->out_gen] = linear->last_value [ch] + input_index *
+										(data->data_in [ch] - linear->last_value [ch]) ;
+			linear->out_gen ++ ;
+			} ;
+
+		/* Figure out the next index. */
+		input_index += 1.0 / src_ratio ;
+		} ;
+
+	/* Main processing loop. */
+	while (linear->out_gen < linear->out_count)
+	{
+		linear->in_used += linear->channels * lrint (floor (input_index)) ;
+		input_index -= floor (input_index) ;
+
+		if (linear->in_used + input_index > linear->in_count)
+			break ;
+
+		if (fabs (psrc->last_ratio - data->src_ratio) > SRC_MIN_RATIO_DIFF)
+			src_ratio = psrc->last_ratio + linear->out_gen * (data->src_ratio - psrc->last_ratio) / (linear->out_count - 1) ;
+
+		for (ch = 0 ; ch < linear->channels ; ch++)
+		{	data->data_out [linear->out_gen] = data->data_in [linear->in_used + ch] + input_index *
+						(data->data_in [linear->in_used + linear->channels + ch] - data->data_in [linear->in_used + ch]) ;
+			linear->out_gen ++ ;
+			} ;
+
+		/* Figure out the next index. */
+		input_index += 1.0 / src_ratio ;
+		} ;
+
+/*-	if (input_index > linear->in_count - linear->in_used)
+	{	input_index -= linear->in_count - linear->in_used ;
+		linear->in_used = linear->in_count ;
+		puts ("XXXXXXXXXX") ; /+*-exit (1) ;-*+/
+		} ;	
+-*/
+
+	psrc->last_position = input_index ;
+
+	for (ch = 0 ; ch < linear->channels ; ch++)
+	{	linear->last_value [ch] = data->data_in [linear->in_used - linear->channels + ch] ;
+
+/*-		data->data_out [0 + ch] = -0.9 ;
+		data->data_out [linear->out_gen - linear->channels + ch] = 0.9 ; -*/
+		} ;
+
+	/* Save current ratio rather then target ratio. */
+	psrc->last_ratio = src_ratio ;
+
+	data->input_frames_used = linear->in_used / linear->channels ;
+	data->output_frames_gen = linear->out_gen / linear->channels ;
+
+	return SRC_ERR_NO_ERROR ;
+} /* linear_process */
+
+/*------------------------------------------------------------------------------
+*/
+
+const char*
+linear_get_name (int src_enum)
+{
+	if (src_enum == SRC_LINEAR)
+		return "Linear Interpolator" ;
+
+	return NULL ;
+} /* linear_get_name */
+
+const char*
+linear_get_description (int src_enum)
+{
+	if (src_enum == SRC_LINEAR)
+		return "Linear interpolator, very fast, poor quality." ;
+
+	return NULL ;
+} /* linear_get_descrition */
+
+int
+linear_set_converter (SRC_PRIVATE *psrc, int src_enum)
+{	LINEAR_DATA *linear ;
+
+	if (src_enum != SRC_LINEAR)
+		return SRC_ERR_BAD_CONVERTER ;
+
+	if (psrc->private_data != NULL)
+	{	linear = (LINEAR_DATA*) psrc->private_data ;
+		if (linear->linear_magic_marker != LINEAR_MAGIC_MARKER)
+		{	free (psrc->private_data) ;
+			psrc->private_data = NULL ;
+			} ;
+		} ;
+
+	if (psrc->private_data == NULL)
+	{	linear = calloc (1, sizeof (*linear) + psrc->channels * sizeof (float)) ;
+		if (linear == NULL)
+			return SRC_ERR_MALLOC_FAILED ;
+		psrc->private_data = linear ;
+		} ;
+
+	linear->linear_magic_marker = LINEAR_MAGIC_MARKER ;
+	linear->channels = psrc->channels ;
+
+	psrc->process = linear_process ;
+	psrc->reset = linear_reset ;
+
+	linear_reset (psrc) ;
+
+	return SRC_ERR_NO_ERROR ;
+} /* linear_set_converter */
+
+/*===================================================================================
+*/
+
+static void
+linear_reset (SRC_PRIVATE *psrc)
+{	LINEAR_DATA *linear ;
+
+	linear = (LINEAR_DATA*) psrc->private_data ;
+	if (linear == NULL)
+		return ;
+
+	memset (linear->last_value, 0, sizeof (linear->last_value [0]) * linear->channels) ;
+} /* linear_reset */